Managed snapshot backup fails

Hi,

trying to get managed backups working on my site, but running the backup gives this message:

Aw shucks, something went wrong :( Instead of the beautiful response we expected, we got this:

<empty response>

i have enbled logging in my wp-config, and the log shows this error:

[20-Jan-2017 09:10:31 UTC] PHP Fatal error:  Allowed memory size of 805306368 bytes exhausted (tried to allocate 16777224 bytes) in /wp-content/plugins/snapshot/lib/Snapshot/Helper/Utility.php on line 528

here are some server infos:
PHP:

Version	7.0.14
max_execution_time	120
memory_limit	768M
upload_max_filesize	128M
post_max_size	128M

i have tried adding this to the wp-config file:
if (!defined('SNAPSHOT_FILESET_CHUNK_SIZE')) define('SNAPSHOT_FILESET_CHUNK_SIZE', 100);

without any success.

Any suggestions on how to resolve this ?
Due to hosting limits, im not able to change the execution time.

i have granted support access :slight_smile: